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Encryption and decryption(urgent)

Plz tell some advantages and disadvantages of multi phase method used for both encryption and decryption ,bcoz i am doing my project in cryptography

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Dazzling_ysi: If you do a project youare supposed to do research and not get the answer handed to you. You can ask for help with it and resources and a solution field is not big enough anyhow to write a "project". But to help you with it, this is a very goodresource on the topic:

http://eprint.iacr.org/2003/181.pdf

Let me citate some lines that I think even answer though shortly your question with FULL credit to the author:

" The advantage of multiple encryption: is that it provides bettersecurity because even if some component ciphers are broken or some ofthe secret keys are compromised, the confidentiality can still bemaintained by the remaining encryptions."

Disadvantage and danger:
" If a multiple encryption has a branch thatends with a parallel block, we are then able to construct an adversaryA that breaks it with only one key exposure query and one decryptionquery.
If a multiple encryption has a branch that ends with a sequentialblock, we may then be able to construct an adversary A that breaks itwith only one key exposure query on the last component and onedecryption query."

For more on the topic please read the pdf.

Posted on Feb 15, 2009

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